fix(iostreams): use colorable stdout to print colors on Windows

Author: Enda Phelan

go.mod

@@ -18,6 +18,7 @@ require (
 	github.com/kataras/tablewriter v0.0.0-20180708051242-e063d29b7c23 // indirect
 	github.com/landoop/tableprinter v0.0.0-20201125135848-89e81fc956e7
 	github.com/markbates/pkger v0.17.1
+	github.com/mattn/go-colorable v0.1.8
 	github.com/mattn/go-isatty v0.0.12
 	github.com/mattn/go-runewidth v0.0.12 // indirect
 	github.com/nicksnyder/go-i18n/v2 v2.1.2

pkg/iostreams/iostreams.go

@@ -4,6 +4,7 @@ import (
 	"io"
 	"os"
 
+	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 )
 
@@ -92,8 +93,8 @@ func System() *IOStreams {
 	io := &IOStreams{
 		In:          os.Stdin,
 		originalOut: os.Stdout,
-		Out:         os.Stdout,
-		ErrOut:      os.Stderr,
+		Out:         colorable.NewColorableStdout(),
+		ErrOut:      colorable.NewColorableStderr(),
 	}
 
 	// prevent duplicate isTerminal queries now that we know the answer